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{"type":"item.completed","item":{"id":"item_1","type":"agent_message","text":"```python\nimport json, hashlib, numpy as np\n\nnames = [\"L%d.%s\"%(k,t) for k in range(1,7) for t in [\"W\",\"b\"]]\nnames += [\"out.W\",\"out.b\"]\ntensors = {n:load(n) for n in names}\nreference = np.load(\"/work/candidate_A.npz\")\nassert all(np.array_equal(tensors[n],reference[n]) for n in names)\nassert all(np.isfinite(a).all() for a in tensors.values())\n\n# Static symmetry checks on weights only; no network evaluation.\nerrors=[]\nfor reflect in [False,True]:\n    for turns in range(4):\n        perm=[]\n        for p in range(81):\n            r,c=divmod(p,9)\n            if reflect: c=8-c\n            for _ in range(turns): r,c=c,8-r\n            perm.append(9*r+c)\n        perm=np.array(perm)\n        ip=np.array([3*perm[p]+ch for p in range(81) for ch in range(3)])\n        hp=np.concatenate([81*ch+perm for ch in range(6)]+[np.arange(486,512)])\n        op=np.r_[perm,81]\n        err=0.0\n        for k in range(1,7):\n            w=tensors[\"L%d.W\"%k]; bb=tensors[\"L%d.b\"%k]\n            rp=ip if k==1 else hp\n            err=max(err,float(np.max(np.abs(w[np.ix_(rp,hp)]-w))))\n            err=max(err,float(np.max(np.abs(bb[hp]-bb))))\n        err=max(err,float(np.max(np.abs(tensors[\"out.W\"][np.ix_(hp,op)]-tensors[\"out.W\"]))))\n        err=max(err,float(np.max(np.abs(tensors[\"out.b\"][op]-tensors[\"out.b\"]))))\n        errors.append(err)\n\nblack=np.load(\"/work/pass_36/logits.npy\")\nwhite=np.load(\"/work/pass_37/logits.npy\")\nprint(\"Checkpoint unchanged:\", True)\nprint(\"Eight board-symmetry weight errors:\", errors)\nprint(\"Colour-swapped placement-logit error:\",float(np.max(np.abs(black[:,:81]-white[:,:81]))))\nprint(\"White pass-logit increments:\",np.round(white[:,81]-black[:,81],6).tolist())\nprint(\"Nonzero weights/biases:\",sum(np.count_nonzero(a) for a in tensors.values()))\ndigest=hashlib.sha256()\nfor n in names:\n    digest.update(n.encode())\n    digest.update(tensors[n].tobytes())\nprint(\"Checkpoint SHA256:\",digest.hexdigest())\njson.dump({\"checkpoint\":digest.hexdigest(),\"validation_passes\":[28,31,32,33,34,35]},\n          open(\"/work/final_validation_manifest.json\",\"w\"),indent=2)\n```"}}
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